interactions of fronto-parietal high frequency rtms on anterior cingulate cortex activation in schizophrenia

Conditions: Schizophrenia

Summary: this will be a single site pilot study. 20 subjects with epp (early phase psychosis), defined as medical record documentation of the onset of clinically significant psychotic symptoms within the past 10 years, will be enrolled. prior to randomization subjects will undergo fmri (functional magnetic resonance imaging) during cc (cognitive control) task (stroop color-word paradigm) and resting-state paradigms. this baseline scan will also include a high-resolution structural sequence for neuronavigation purposes. then, on two separate days, each occurring one-week apart, subjects will receive one session of excitatory (20 hz) (hertz) rtms (repetitive transcranial magnetic stimulation) targeting the ldlpfc (left dorsolateral prefrontal cortex) and one session targeting the lspc (left superior parietal cortex). the order of stimulation sites will be randomized and counter-balanced. immediately following each session, subjects will undergo repeat fmri during cc and rs (resting state) paradigms. investigators will also examine the effect of rtms on cc performance.

in spite of existing work studying rtms as a treatment modality in schizophrenia, there are no studies that have examined the effects of rtms targeting superficial ccn (cognitive control network) structures (ldlpfc and lspc) on acc (anterior cingulate cortex) activity or ccn connectivity in schizophrenia. it is also important to note that the vast majority of studies using rtms in schizophrenia have examined chronic populations where confounds associated with prolonged duration of illness may be present. epp is a desirable population to study because these individuals tend to have fewer psychiatric and physical comorbidities and less antipsychotic drug exposure, all of which are factors that may confound investigations of new treatment interventions for this illness. in light of the significant unmet medical need associated with schizophrenia and the grave clinical effect of disrupted cc in the illness, rtms modulating the acc, and potentially ccn circuitry, represents an unexplored and novel potential treatment option. the goal of this project is to utilize hf (20 hz) rtms, in conjunction with functional magnetic resonance imaging (fmri), to provide evidence that rtms targeting superficial ccn structures (ldlpfc and lspc) modulates: 1) activation in the acc during in-scanner cc task performance and 2) functional connectivity between the ccn structures during in-scanner cc task performance. this study will provide vital preliminary data on target engagement informing future clinical trials seeking to investigate rtms as a novel treatment for cc impairment in schizophrenia. this study will also seek to refine the understanding of the brain circuitry that mediates the potential pro-cc effects of rtms through the use of fmri at baseline and following the course of rtms administration.

Eligibility criteria:
inclusion criteria: 1. between 18 and 40 years of age 2. within 10 years of illness onset as defined by entry into treatment for psychotic symptoms 3. able to give informed consent 4. willing and able to adhere to the study schedule 5. mini-international neuropsychiatric interview (mini)37-40 diagnosis of schizophrenia 6. clinical stability defined by: 1. subjects must not have experienced an exacerbation of their illness within 4 weeks prior to randomization, leading to an intensification of psychiatric care in the opinion of the investigator. examples of intensification of care include, but are not limited to: inpatient hospitalization, day/partial hospitalization, outpatient crisis management, or psychiatric treatment in an emergency room and 2. antipsychotic treatment stability for at least 4 weeks prior to randomization (no change in antipsychotic dosing or addition of new antipsychotic medication) exclusion criteria: 1. lifetime history of a seizure, excluding febrile seizures and those induced by substance withdrawal 2. first degree relative with idiopathic epilepsy or other seizure disorder 3. history of significant neurological illness 4. history of head trauma as defined by a loss of consciousness or a post-concussive syndrome 5. pregnant or breast feeding 6. known iq \< 70 based on subject report 7. current acute, serious, or unstable medical conditions 8. metallic objects planted in or near the head, including implanted pacemaker, medication pump, vagal stimulator, deep brain stimulator, tens unit, ventriculoperitoneal shunt, or cochlear implants 9. contraindications to mri or otherwise unable to tolerate mri procedures 10. history of electroconvulsive therapy 11. subjects taking clozapine 12. subjects who have participated in a clinical trial with any pharmacological treatment intervention for which they received study-related medication in the 4 weeks prior to randomization 13. subjects considered a high risk for suicidal acts - active suicidal ideation as determined by clinical interview or any suicide attempt in 90 days prior to screening 14. current dsm-5 diagnosis of alcohol or drug use disorder (excluding nicotine or caffeine) 15. subjects who require concomitant treatment with prohibited medication, as specified in attachment 2

Keywords: schizophrenia psychosis early phase psychosis rtms